Saunier Duval Air Pressure Switch Isofast F 35 E H MOD Ref. S5744100
When you turn on the heating of your Saunier Duval Isofast F 35 E H MOD boiler, the air pressure switch is responsible for monitoring the air pressure, allowing the system to operate correctly. If this part fails, you will notice that the boiler does not start or gets locked, even though the pressure may be correct, and the fault code 02: Air flow safety may appear. This pressure switch is compatible with several models from the Isofast range, as well as with other models from the Isomax, Isotwin, and Themafast ranges, among others. It is recommended to replace it when the boiler shows the mentioned symptoms.
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Consult via WhatsAppSaunier Duval boilers compatible with reference S5744100
Pressure switch with reference S5744100. 21 verified compatibilities: F 30 E H-MOD and F 35 E1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval F 30 E H-MOD | Isofast | Contrasted |
| Saunier Duval F 35 E1 | Isofast | Contrasted |
| Saunier Duval F 35 E H-MOD | Isofast | Contrasted |
| Saunier Duval F 28 E2 | Isomax | Contrasted |
| Saunier Duval F 28 EA | Isotwin | Contrasted |
| Saunier Duval F 30 E H-MOD | Isotwin | Contrasted |
| Saunier Duval F 30 E | Isosplit | Contrasted |
| Saunier Duval F 35 E | Isosplit | Contrasted |
| Saunier Duval F 35 E H-MOD | Isosplit | Contrasted |
| Saunier Duval F 25 E | Themafast | Contrasted |
| Saunier Duval F 25 E H-MOD | Themafast | Contrasted |
| Saunier Duval F 30 E | Themafast | Contrasted |
| Saunier Duval F 30 E H-MOD | Themafast | Contrasted |
| Saunier Duval F 25 E | Thema | Contrasted |
| Saunier Duval F 25 E STL | Thema | Contrasted |
| Saunier Duval F AS 25 E | Thema | Contrasted |
| Saunier Duval F 25 E | Themaplus | Contrasted |
| Saunier Duval F 30 E | Themaplus | Contrasted |
| Saunier Duval F AS 30 E | Themaclassic | Contrasted |
| Saunier Duval F 17 E | Opalia | Contrasted |
| Saunier Duval F 17 E | Opaliafast | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if ref. S5744100 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference S5744100. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the pressure switch S5744100 resolves.
The pressure switch controls the air or water pressure to authorize operation. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler does not ignite and the display shows an air pressure switch fault.
Cause: The pressure switch does not reach the necessary point to send the correct signal to the control board, which interrupts the ignition attempt.
Check the entire flue duct: length, number of bends, and ensure it is not obstructed, as these models are sensitive to pressure loss.
- 02
The extractor starts and spins, but the burner never ignites.
Cause: Even if the extractor is working, if the pressure switch does not close the contact due to a dirty pressure take-off or a disconnected tube, the control board does not allow the gas to flow.
Check that the silicone tubes connecting the pressure switch to the venturi are properly connected, without cracks or water accumulation inside.
- 03
The blockage is intermittent and seems to be associated with the flue gas outlet.
Cause: In installations with shared outlets or long ducts, a small variation in draft can take the pressure switch out of its switching range.
Check if the fault changes depending on the type of flue installation or wind conditions before replacing the part.
Fault codes from Saunier Duval that this spare part resolves.
| Code | Fault | Diagnosis and solution |
|---|---|---|
| 02 | Air flow safety. | The air pressure switch S5744100 does not switch when the fan starts or does not detect the depression due to obstruction in tubes/venturi; check with a multimeter or manometer that the pressure switch changes state with the fan running and inspect tubes and connections. |
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Datasheet for Saunier Duval pressure switch S5744100
- Catalogue reference
- S5744100
- Brand
- Saunier Duval
- Type of part
- Pressure switches
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Part code
- 605.99534
- Set (opening/closing)
- 59/51 Pa
- Contact electric charge
- 1(0.5) A / 250V~
- Internal code
- 116189
- Batch code
- VVHACG
- Manufacturing date (week/year)
- 02/06
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval F 35 E H-MOD Manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the pressure switch S5744100
Does this air pressure switch work for the Saunier Duval Isofast F 35 E H MOD?
Does this pressure switch also work for the Saunier Duval Themafast F30?
At what pressure does the pressure switch of the Isofast F 35 E H MOD switch?
Is the pressure switch of the Isofast F 35 E H MOD for water or air?
Is this pressure switch suitable for the Saunier Duval Opalia F17 E?
Spare parts related to Saunier Duval Themafast
